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CBSE Class 8 Science Worksheet

1.
Write the different techniques used in extinguishing fire.
2.
Fill in the blanks: Sound is produced by _______________ objects.
3.
State True or False: Speed of sound is more in the air than in water.
A) true B) false
4.
State True or False: Force has both magnitude and direction.
A) true B) false
5.
Why are the shoulder bags provided with the broad straps?
6.
Fill in the blanks: Barometer was invented by ______________________.
7.
Choose the correct answer: Gravitational force acts on _________________.
A) Only planetary bodies. B) Only satellites C) All bodies D) None of these
8.
Choose the correct answer: Force acting on a unit area of surface is known as ___________________.
A) Motion B) Pressure C) Force D) Impulse
9.
Fill in the Blank: Carbon dioxide can be stored in ________ form.
10.
Choose the correct answer: Where is the pressure greater, 20 m below the sea level or 40 m below the sea level?
A) 20 m below the sea level B) 40 m below the sea level C) Same at both level D) None of these
11.
State True or False: Middle zone is the hottest zone a flame.
A) true B) false
12.
State True or False: Pressure doesn't depend upon size and shape of the container.
A) true B) false
13.
Fill in the blanks: We _______ the rope to draw a bucket from the well.
14.
Fill in the blanks: The walls of a dam are _____________ near the bottom than at the top.
15.
Fill in the Blank: Calorific value of kerosene is _______ than that of wood.
16.
Choose the correct answer: SI unit of force is __________________________.
A) Pascal B) Ampere C) Newton D) Watt
17.
Write three conditions or combustion to take place.
18.
State True or False: Rusting can also be called as combustion.
A) true B) false
19.
Choose the correct answer: Where the sound can't travel?
A) Metals B) Water C) Air D) Vacuum
20.
Which of the following substance burns in air at room temperature?
A) Copper B) Iodine C) Phosphorus D) Magnesium

CBSE Class 8 Science Worksheet

Answers

1.
(i) Removing combustible substance; (ii) Cooling the burning substance below its ignition temperature; (iii) Cutting off the supply of oxygen.
2.
Vibrating
3.
Option B
4.
Option A

5.
Broad straps help to increase the increase the area of contact of the bag with the shoulder. So, the pressure on the shoulder is reduced and it is easier to carry the bag.
6.
E. Torricelli
7.
Option C
8.
Option B

9.
liquid
10.
Option B
11.
Option B
12.
Option B

13.
Pull
14.
Thicker
15.
greater
16.
Option C

17.
(i) Presence of combustible substance; (ii) Proper supply of air for oxygen; (iii) Attainment of ignition temperature.
18.
Option B
19.
Option D
20.
Option C
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